Wish to learn about biological media(CR/HB and Bio-Homme)...
Life span
1) Need to change after certain period of time? When and how frequent?
2) Need to wash with tank water? When and how frequent?
3) No life-span and dont touch the media? (e.g: OHF or Sump tank)
Last edited by war-z; 07-05-2011 at 12:11 PM.
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